My data shows that pack temps jump 10-15F immediately during QC and continues to rise for quite some time after that. The temp sensors are measuring air temps in the pack, not cell temp, so there is some delay there.
L2 does very little.
As QueenBee states, it's physics which determines heat rise. Charging at 35 kW instead of 3.5 kW generates exponentially more heat. P = I^2*R. A newish pack has a resistance of about 0.1 ohms. 3.5kW L2 is around 10 amps, QC is around 100 amps, or 10 watts compared to 1000 watts. That's 100 times more heat when charging 10 times faster.
Not only that, but because the pack is relatively well insulated, that heat has nowhere to go. L2 charging heat is negligible when compared to QC.
All that said, once daily QC will only have a moderate effect on rate of capacity loss, accelerating loss of capacity perhaps 20% as shown in in INL ATVA testing.
L2 does very little.
As QueenBee states, it's physics which determines heat rise. Charging at 35 kW instead of 3.5 kW generates exponentially more heat. P = I^2*R. A newish pack has a resistance of about 0.1 ohms. 3.5kW L2 is around 10 amps, QC is around 100 amps, or 10 watts compared to 1000 watts. That's 100 times more heat when charging 10 times faster.
Not only that, but because the pack is relatively well insulated, that heat has nowhere to go. L2 charging heat is negligible when compared to QC.
All that said, once daily QC will only have a moderate effect on rate of capacity loss, accelerating loss of capacity perhaps 20% as shown in in INL ATVA testing.